Parada Berger was a member of the
Democratic Party. He served as councillor (regidor) of the Municipality of Victoria in 1935 and as a member of the local neighborhood council between 1933 and 1935. He was elected deputy for the Twentieth Departmental Grouping (Traiguén, Victoria and Lautaro) for the 1937–1941 legislative period. During his term, he served on the Standing Committees on Constitution, Legislation and Justice, and on Foreign Relations. He authored several legislative initiatives, including bills granting equal political and civil rights to men and women, establishing a maximum annual rental rate of 7% based on fiscal valuation, creating a State monopoly for essential goods, eliminating enrollment fees and other charges in public education, and providing mandatory breakfast and lunch in public schools. He was appointed Minister of Justice by President
Gabriel González Videla and served in that position between 26 June 1950 and 29 July 1952. == Other activities ==